diff --git a/benchcab/bench_config.py b/benchcab/bench_config.py
index a85852e7..509f551e 100644
--- a/benchcab/bench_config.py
+++ b/benchcab/bench_config.py
@@ -43,31 +43,41 @@ def check_config(config: dict):
                 "that is compatible with the f90nml python package."
             )
 
-    # the "pbs" key is optional
-    if "pbs" in config:
-        if not isinstance(config["pbs"], dict):
-            raise TypeError("The 'pbs' key must be a dictionary.")
-        # the "ncpus" key is optional
-        if "ncpus" in config["pbs"] and not isinstance(config["pbs"]["ncpus"], int):
-            raise TypeError("The 'ncpus' key must be an integer.")
-        # the "mem" key is optional
-        if "mem" in config["pbs"] and not isinstance(config["pbs"]["mem"], str):
-            raise TypeError("The 'mem' key must be a string.")
-        # the "walltime" key is optional
-        if "walltime" in config["pbs"] and not isinstance(
-            config["pbs"]["walltime"], str
-        ):
-            raise TypeError("The 'walltime' key must be a string.")
-        # the "storage" key is optional
-        if "storage" in config["pbs"]:
-            if not isinstance(config["pbs"]["storage"], list) or any(
-                not isinstance(val, str) for val in config["pbs"]["storage"]
+    # the "fluxsite" key is optional
+    if "fluxsite" in config:
+        if not isinstance(config["fluxsite"], dict):
+            raise TypeError("The 'fluxsite' key must be a dictionary.")
+        # the "pbs" key is optional
+        if "pbs" in config["fluxsite"]:
+            if not isinstance(config["fluxsite"]["pbs"], dict):
+                raise TypeError("The 'pbs' key must be a dictionary.")
+            # the "ncpus" key is optional
+            if "ncpus" in config["fluxsite"]["pbs"] and not isinstance(
+                config["fluxsite"]["pbs"]["ncpus"], int
             ):
-                raise TypeError("The 'storage' key must be a list of strings.")
-
-    # the "multiprocessing" key is optional
-    if "multiprocessing" in config and not isinstance(config["multiprocessing"], bool):
-        raise TypeError("The 'multiprocessing' key must be a boolean.")
+                raise TypeError("The 'ncpus' key must be an integer.")
+            # the "mem" key is optional
+            if "mem" in config["fluxsite"]["pbs"] and not isinstance(
+                config["fluxsite"]["pbs"]["mem"], str
+            ):
+                raise TypeError("The 'mem' key must be a string.")
+            # the "walltime" key is optional
+            if "walltime" in config["fluxsite"]["pbs"] and not isinstance(
+                config["fluxsite"]["pbs"]["walltime"], str
+            ):
+                raise TypeError("The 'walltime' key must be a string.")
+            # the "storage" key is optional
+            if "storage" in config["fluxsite"]["pbs"]:
+                if not isinstance(config["fluxsite"]["pbs"]["storage"], list) or any(
+                    not isinstance(val, str)
+                    for val in config["fluxsite"]["pbs"]["storage"]
+                ):
+                    raise TypeError("The 'storage' key must be a list of strings.")
+        # the "multiprocessing" key is optional
+        if "multiprocessing" in config["fluxsite"] and not isinstance(
+            config["fluxsite"]["multiprocessing"], bool
+        ):
+            raise TypeError("The 'multiprocessing' key must be a boolean.")
 
     valid_experiments = (
         list(internal.MEORG_EXPERIMENTS) + internal.MEORG_EXPERIMENTS["five-site-test"]
diff --git a/benchcab/benchcab.py b/benchcab/benchcab.py
index 7bb47d40..b6850f66 100644
--- a/benchcab/benchcab.py
+++ b/benchcab/benchcab.py
@@ -211,10 +211,13 @@ def fluxsite_run_tasks(self):
         """Endpoint for `benchcab fluxsite-run-tasks`."""
         tasks = self.tasks if self.tasks else self._initialise_tasks()
         print("Running fluxsite tasks...")
-        multiprocess = self.config.get("multiprocessing", internal.DEFAULT_MULTIPROCESS)
+        try:
+            multiprocess = self.config["fluxsite"]["multiprocess"]
+        except KeyError:
+            multiprocess = internal.FLUXSITE_DEFAULT_MULTIPROCESS
         if multiprocess:
             ncpus = self.config.get("pbs", {}).get(
-                "ncpus", internal.DEFAULT_PBS["ncpus"]
+                "ncpus", internal.FLUXSITE_DEFAULT_PBS["ncpus"]
             )
             run_tasks_in_parallel(tasks, n_processes=ncpus, verbose=self.args.verbose)
         else:
@@ -234,11 +237,15 @@ def fluxsite_bitwise_cmp(self):
         comparisons = get_fluxsite_comparisons(tasks)
 
         print("Running comparison tasks...")
-        multiprocess = self.config.get("multiprocessing", internal.DEFAULT_MULTIPROCESS)
+        try:
+            multiprocess = self.config["fluxsite"]["multiprocess"]
+        except KeyError:
+            multiprocess = internal.FLUXSITE_DEFAULT_MULTIPROCESS
         if multiprocess:
-            ncpus = self.config.get("pbs", {}).get(
-                "ncpus", internal.DEFAULT_PBS["ncpus"]
-            )
+            try:
+                ncpus = self.config["fluxsite"]["pbs"]["ncpus"]
+            except KeyError:
+                ncpus = internal.FLUXSITE_DEFAULT_PBS["ncpus"]
             run_comparisons_in_parallel(
                 comparisons, n_processes=ncpus, verbose=self.args.verbose
             )
diff --git a/benchcab/comparison.py b/benchcab/comparison.py
index db89f545..627bbe3f 100644
--- a/benchcab/comparison.py
+++ b/benchcab/comparison.py
@@ -60,7 +60,7 @@ def run_comparisons(comparison_tasks: list[ComparisonTask], verbose=False) -> No
 
 def run_comparisons_in_parallel(
     comparison_tasks: list[ComparisonTask],
-    n_processes=internal.DEFAULT_PBS["ncpus"],
+    n_processes=internal.FLUXSITE_DEFAULT_PBS["ncpus"],
     verbose=False,
 ) -> None:
     """Runs bitwise comparison tasks in parallel across multiple processes."""
diff --git a/benchcab/internal.py b/benchcab/internal.py
index 816da2ad..daf0de37 100644
--- a/benchcab/internal.py
+++ b/benchcab/internal.py
@@ -11,9 +11,14 @@
 
 # Parameters for job script:
 QSUB_FNAME = "benchmark_cable_qsub.sh"
-DEFAULT_PBS: Any = {"ncpus": 18, "mem": "30GB", "walltime": "6:00:00", "storage": []}
+FLUXSITE_DEFAULT_PBS: Any = {
+    "ncpus": 18,
+    "mem": "30GB",
+    "walltime": "6:00:00",
+    "storage": [],
+}
 MPI = False
-DEFAULT_MULTIPROCESS = True
+FLUXSITE_DEFAULT_MULTIPROCESS = True
 
 # DIRECTORY PATHS/STRUCTURE:
 
diff --git a/benchcab/task.py b/benchcab/task.py
index 07c615b4..30395d50 100644
--- a/benchcab/task.py
+++ b/benchcab/task.py
@@ -335,7 +335,7 @@ def run_tasks(tasks: list[Task], verbose=False):
 
 
 def run_tasks_in_parallel(
-    tasks: list[Task], n_processes=internal.DEFAULT_PBS["ncpus"], verbose=False
+    tasks: list[Task], n_processes=internal.FLUXSITE_DEFAULT_PBS["ncpus"], verbose=False
 ):
     """Runs tasks in `tasks` in parallel across multiple processes."""
 
diff --git a/benchcab/utils/pbs.py b/benchcab/utils/pbs.py
index 289168d4..c02abb25 100644
--- a/benchcab/utils/pbs.py
+++ b/benchcab/utils/pbs.py
@@ -21,20 +21,20 @@ def render_job_script(
     """
 
     if pbs_config is None:
-        pbs_config = internal.DEFAULT_PBS
+        pbs_config = internal.FLUXSITE_DEFAULT_PBS
 
     module_load_lines = "\n".join(
         f"module load {module_name}" for module_name in modules
     )
     verbose_flag = "-v" if verbose else ""
-    ncpus = pbs_config.get("ncpus", internal.DEFAULT_PBS["ncpus"])
-    mem = pbs_config.get("mem", internal.DEFAULT_PBS["mem"])
-    walltime = pbs_config.get("walltime", internal.DEFAULT_PBS["walltime"])
+    ncpus = pbs_config.get("ncpus", internal.FLUXSITE_DEFAULT_PBS["ncpus"])
+    mem = pbs_config.get("mem", internal.FLUXSITE_DEFAULT_PBS["mem"])
+    walltime = pbs_config.get("walltime", internal.FLUXSITE_DEFAULT_PBS["walltime"])
     storage_flags = [
         "gdata/ks32",
         "gdata/hh5",
         f"gdata/{project}",
-        *pbs_config.get("storage", internal.DEFAULT_PBS["storage"]),
+        *pbs_config.get("storage", internal.FLUXSITE_DEFAULT_PBS["storage"]),
     ]
     return f"""#!/bin/bash
 #PBS -l wd
diff --git a/docs/user_guide/config_options.md b/docs/user_guide/config_options.md
index ee2a52af..63d7e610 100644
--- a/docs/user_guide/config_options.md
+++ b/docs/user_guide/config_options.md
@@ -43,44 +43,48 @@ The different running modes of `benchcab` are solely dependent on the options us
 
 : NCI modules to use for compiling CABLE
 
-### `pbs`
+### `fluxsite`
+: Contains settings specific to fluxsite tests.
+
+#### `pbs`
 
 : Contains settings specific to the PBS scheduler at NCI for the PBS script running the CABLE simulations at FLUXNET sites and the bitwise comparison for these simulations.
 
-#### `ncpus`
+##### `ncpus`
 
 : The number of CPU cores to allocate for the PBS job, i.e. the `-l ncpus=<4>` PBS flag (see [PBS Directives Explained][nci-pbs-directives]). 
 : This key is **optional** and can be omitted from the config file. By default `ncpus` is set to `18`.
 
-#### `mem`
+##### `mem`
 
 : The total memory limit for the PBS job, i.e. the `-l mem=<10GB>` PBS flag (see [PBS Directives Explained][nci-pbs-directives]).
 : This key is **optional** and can be omitted from the config file. By default `mem` is set to `30GB`.
 
-#### `walltime`
+##### `walltime`
 
 : The wall clock time limit for the PBS job, i.e. `-l walltime=<HH:MM:SS>` PBS flag (see [PBS Directives Explained][nci-pbs-directives]).
 : This key is **optional** and can be omitted from the config file. By default `walltime` is set to `6:00:00`.
 
-#### `storage`
+##### `storage`
 
 : A list of extra storage flags required for the PBS job, i.e. `-l storage=<scratch/a00>` (see [PBS Directives Explained][nci-pbs-directives]).
 : This key is **optional** and can be omitted from the config file. By default `storage` is set to `[]`.
 
-Example:
-```yaml
-pbs:
-  ncpus: 16
-  mem: 64GB
-  walltime: 00:01:00
-  storage: [scratch/a00, gdata/xy11]
-```
-
-### `multiprocessing`
+#### `multiprocessing`
 
 : Enables or disables multiprocessing for executing embarrassingly parallel tasks.
 : This key is **optional** and can be omitted from the config file. By default `multiprocessing` is set to `True`.
 
+Example:
+```yaml
+fluxsite:
+  pbs:
+    ncpus: 16
+    mem: 64GB
+    walltime: 00:01:00
+    storage: [scratch/a00, gdata/xy11]
+  multiprocessing: True
+```
 
 ## Simulations options
 
diff --git a/tests/common.py b/tests/common.py
index 66ff7a39..a135249b 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -55,13 +55,15 @@ def get_mock_config() -> dict:
                 }
             },
         ],
-        "pbs": {
-            "ncpus": 16,
-            "mem": "64G",
-            "walltime": "01:00:00",
-            "storage": ["gdata/foo123"],
+        "fluxsite": {
+            "pbs": {
+                "ncpus": 16,
+                "mem": "64G",
+                "walltime": "01:00:00",
+                "storage": ["gdata/foo123"],
+            },
+            "multiprocessing": True,
         },
-        "multiprocessing": True,
     }
     return config
 
diff --git a/tests/test_bench_config.py b/tests/test_bench_config.py
index a51b94ee..02a7adf9 100644
--- a/tests/test_bench_config.py
+++ b/tests/test_bench_config.py
@@ -55,34 +55,39 @@ def test_check_config():
     config.pop("science_configurations")
     check_config(config)
 
+    # Success case: test config without fluxsite key is valid
+    config = get_mock_config()
+    config.pop("fluxsite")
+    check_config(config)
+
     # Success case: test config without multiprocessing key is valid
     config = get_mock_config()
-    config.pop("multiprocessing")
+    config["fluxsite"].pop("multiprocessing")
     check_config(config)
 
     # Success case: test config without pbs key is valid
     config = get_mock_config()
-    config.pop("pbs")
+    config["fluxsite"].pop("pbs")
     check_config(config)
 
     # Success case: test config without ncpus key is valid
     config = get_mock_config()
-    config["pbs"].pop("ncpus")
+    config["fluxsite"]["pbs"].pop("ncpus")
     check_config(config)
 
     # Success case: test config without mem key is valid
     config = get_mock_config()
-    config["pbs"].pop("mem")
+    config["fluxsite"]["pbs"].pop("mem")
     check_config(config)
 
     # Success case: test config without walltime key is valid
     config = get_mock_config()
-    config["pbs"].pop("walltime")
+    config["fluxsite"]["pbs"].pop("walltime")
     check_config(config)
 
     # Success case: test config without storage key is valid
     config = get_mock_config()
-    config["pbs"].pop("storage")
+    config["fluxsite"]["pbs"].pop("storage")
     check_config(config)
 
     # Failure case: test missing required keys raises an exception
@@ -237,46 +242,52 @@ def test_check_config():
         config["science_configurations"] = [r"cable_user%GS_SWITCH = 'medlyn'"]
         check_config(config)
 
+    # Failure case: type of config["fluxsite"] is not a dict
+    with pytest.raises(TypeError, match="The 'fluxsite' key must be a dictionary."):
+        config = get_mock_config()
+        config["fluxsite"] = ["ncpus: 16\nmem: 64GB\n"]
+        check_config(config)
+
     # Failure case: type of config["pbs"] is not a dict
     with pytest.raises(TypeError, match="The 'pbs' key must be a dictionary."):
         config = get_mock_config()
-        config["pbs"] = "-l ncpus=16"
+        config["fluxsite"]["pbs"] = "-l ncpus=16"
         check_config(config)
 
     # Failure case: type of config["pbs"]["ncpus"] is not an int
     with pytest.raises(TypeError, match="The 'ncpus' key must be an integer."):
         config = get_mock_config()
-        config["pbs"]["ncpus"] = "16"
+        config["fluxsite"]["pbs"]["ncpus"] = "16"
         check_config(config)
 
     # Failure case: type of config["pbs"]["mem"] is not a string
     with pytest.raises(TypeError, match="The 'mem' key must be a string."):
         config = get_mock_config()
-        config["pbs"]["mem"] = 64
+        config["fluxsite"]["pbs"]["mem"] = 64
         check_config(config)
 
     # Failure case: type of config["pbs"]["walltime"] is not a string
     with pytest.raises(TypeError, match="The 'walltime' key must be a string."):
         config = get_mock_config()
-        config["pbs"]["walltime"] = 60
+        config["fluxsite"]["pbs"]["walltime"] = 60
         check_config(config)
 
     # Failure case: type of config["pbs"]["storage"] is not a list
     with pytest.raises(TypeError, match="The 'storage' key must be a list of strings."):
         config = get_mock_config()
-        config["pbs"]["storage"] = "gdata/foo+gdata/bar"
+        config["fluxsite"]["pbs"]["storage"] = "gdata/foo+gdata/bar"
         check_config(config)
 
     # Failure case: type of config["pbs"]["storage"] is not a list of strings
     with pytest.raises(TypeError, match="The 'storage' key must be a list of strings."):
         config = get_mock_config()
-        config["pbs"]["storage"] = [1, 2, 3]
+        config["fluxsite"]["pbs"]["storage"] = [1, 2, 3]
         check_config(config)
 
     # Failure case: type of config["multiprocessing"] is not a bool
     with pytest.raises(TypeError, match="The 'multiprocessing' key must be a boolean."):
         config = get_mock_config()
-        config["multiprocessing"] = 1
+        config["fluxsite"]["multiprocessing"] = 1
         check_config(config)
 
 
diff --git a/tests/test_pbs.py b/tests/test_pbs.py
index 2c5e5e2d..cb678b17 100644
--- a/tests/test_pbs.py
+++ b/tests/test_pbs.py
@@ -16,9 +16,9 @@ def test_render_job_script():
     ) == (
         f"""#!/bin/bash
 #PBS -l wd
-#PBS -l ncpus={internal.DEFAULT_PBS["ncpus"]}
-#PBS -l mem={internal.DEFAULT_PBS["mem"]}
-#PBS -l walltime={internal.DEFAULT_PBS["walltime"]}
+#PBS -l ncpus={internal.FLUXSITE_DEFAULT_PBS["ncpus"]}
+#PBS -l mem={internal.FLUXSITE_DEFAULT_PBS["mem"]}
+#PBS -l walltime={internal.FLUXSITE_DEFAULT_PBS["walltime"]}
 #PBS -q normal
 #PBS -P tm70
 #PBS -j oe
@@ -54,9 +54,9 @@ def test_render_job_script():
     ) == (
         f"""#!/bin/bash
 #PBS -l wd
-#PBS -l ncpus={internal.DEFAULT_PBS["ncpus"]}
-#PBS -l mem={internal.DEFAULT_PBS["mem"]}
-#PBS -l walltime={internal.DEFAULT_PBS["walltime"]}
+#PBS -l ncpus={internal.FLUXSITE_DEFAULT_PBS["ncpus"]}
+#PBS -l mem={internal.FLUXSITE_DEFAULT_PBS["mem"]}
+#PBS -l walltime={internal.FLUXSITE_DEFAULT_PBS["walltime"]}
 #PBS -q normal
 #PBS -P tm70
 #PBS -j oe
@@ -92,9 +92,9 @@ def test_render_job_script():
     ) == (
         f"""#!/bin/bash
 #PBS -l wd
-#PBS -l ncpus={internal.DEFAULT_PBS["ncpus"]}
-#PBS -l mem={internal.DEFAULT_PBS["mem"]}
-#PBS -l walltime={internal.DEFAULT_PBS["walltime"]}
+#PBS -l ncpus={internal.FLUXSITE_DEFAULT_PBS["ncpus"]}
+#PBS -l mem={internal.FLUXSITE_DEFAULT_PBS["mem"]}
+#PBS -l walltime={internal.FLUXSITE_DEFAULT_PBS["walltime"]}
 #PBS -q normal
 #PBS -P tm70
 #PBS -j oe
@@ -165,9 +165,9 @@ def test_render_job_script():
     ) == (
         f"""#!/bin/bash
 #PBS -l wd
-#PBS -l ncpus={internal.DEFAULT_PBS["ncpus"]}
-#PBS -l mem={internal.DEFAULT_PBS["mem"]}
-#PBS -l walltime={internal.DEFAULT_PBS["walltime"]}
+#PBS -l ncpus={internal.FLUXSITE_DEFAULT_PBS["ncpus"]}
+#PBS -l mem={internal.FLUXSITE_DEFAULT_PBS["mem"]}
+#PBS -l walltime={internal.FLUXSITE_DEFAULT_PBS["walltime"]}
 #PBS -q normal
 #PBS -P tm70
 #PBS -j oe